diff options
| author | Nicolas Boichat <drinkcat@chromium.org> | 2016-01-18 21:35:01 +0800 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2016-03-12 14:25:44 +0100 |
| commit | 99e79f2963d556abc263f2b88adfa41d3022c78a (patch) | |
| tree | b64c76ceb3c83d5def119f2fcefd99b14d787cd1 | |
| parent | 8c1f2d6307bca9f9e43583497d691ce72cfb7c6c (diff) | |
| download | for-greg-99e79f2963d556abc263f2b88adfa41d3022c78a.tar.gz | |
ALSA: seq: Fix snd_seq_call_port_info_ioctl in compat mode
commit 9586495dc3011a80602329094e746dbce16cb1f1 upstream.
This reverts one hunk of
commit ef44a1ec6eee ("ALSA: sound/core: use memdup_user()"), which
replaced a number of kmalloc followed by memcpy with memdup calls.
In this case, we are copying from a struct snd_seq_port_info32 to a
struct snd_seq_port_info, but the latter is 4 bytes longer than the
32-bit version, so we need to separate kmalloc and copy calls.
Fixes: ef44a1ec6eee ('ALSA: sound/core: use memdup_user()')
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | sound/core/seq/seq_compat.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/sound/core/seq/seq_compat.c b/sound/core/seq/seq_compat.c index c956fe46256923..9bb2c39384795b 100644 --- a/sound/core/seq/seq_compat.c +++ b/sound/core/seq/seq_compat.c @@ -48,11 +48,12 @@ static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned struct snd_seq_port_info *data; mm_segment_t fs; - data = memdup_user(data32, sizeof(*data32)); - if (IS_ERR(data)) - return PTR_ERR(data); + data = kmalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; - if (get_user(data->flags, &data32->flags) || + if (copy_from_user(data, data32, sizeof(*data32)) || + get_user(data->flags, &data32->flags) || get_user(data->time_queue, &data32->time_queue)) goto error; data->kernel = NULL; |